JPS638346B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION SUMMARY OF THE INVENTION An electro-hydraulic operated device, particularly a valve, is disclosed;
A device of this kind comprises at least one control piston movable in a housing, the housing comprising at least one exhaust nozzle enabling the advancement of the piston into its possible operating position, the exhaust nozzle being It is shut off by an electromagnetically actuated closure device to retract the piston from its position. In order to considerably reduce the electrical energy for the electromagnetic closing device of this type of device, the magnetic iron of the closing device is operated in such a way that the closing device is also held in its closed position during switching of the control piston. A permanent magnet is provided, but the closure device is already deprived of electrical energy supply.

The present invention relates to an electro-hydraulic operated device, in particular a valve, comprising at least one control piston movable within a housing, the housing enabling advancement of the control piston to its possible working positions. at least one exhaust nozzle for retracting the control piston from the working position, which nozzle can be shut off by a closing device, which can be moved at least partially to the closed position by means of an electromagnet. can.

BACKGROUND OF THE INVENTION Fluid-operated valves are known which have a control system with a closing device and an electromagnetic device for actuating this closing device. In valves of this type, the magnet arrangement is supplied with electrical energy during the closing process and the entire duration of the closed state of the closing device, consuming relatively large amounts of electrical energy for supplying the control system. Therefore, operation with batteries but not with network operation is severely restricted.

It is an object of the invention to provide an electro-hydraulic operated device of the type mentioned at the outset, which can be operated economically by means of a battery;
In particular, it provides a valve.

This object is achieved according to the invention by arranging at least one fluid control piston in a housing, which is displaceable and equipped with return means, and which housing is adapted to drive said control piston in one direction to a first working position. at least one exhaust nozzle for causing
a closing device for closing the exhaust nozzle before the control piston moves away from the first operating position, the closing device being at least partially displaced to the closed position by an electromagnet and magnetically engaged with the control piston; and a device for deenergizing the electromagnet when the closure device is closed, and for automatically switching the closure device when the control piston is displaced to open the exhaust nozzle. and an electro-hydraulic actuated device characterized in that the control piston switches the magnetic engagement between the closure device and the permanent magnet.

This significantly reduces the electrical energy consumption for the operation of the closure device and thus makes it possible to operate the device economically but with battery but not with network operation. After the exhaust nozzle of the device has been closed, a permanent magnet can further keep the closing device closed while the control piston is in its operating position, even if the electromagnetic device is switched off. In this case, when the force of the permanent magnet is no longer sufficient to keep the closing device closed, its restoring force opens it again. The piston remains in its new position until it obtains a return thrust.
As can be seen, since the electromagnetic device is supplied with current at most until the closing device is closed, the savings in electrical operating energy are extremely large.
This saving in electrical energy is so great that the device according to the invention can be operated for 50 to 70 million times using conventional batteries, thus making economical operation possible with this type of battery. Furthermore, it is an object of the invention to provide a device that is simple, inexpensive and easy to manufacture.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

The embodiment according to FIG. 1 in the form of a valve comprises a main housing 1 and a secondary housing 2 consisting of a main body 1a and two covers 1b and 1c. Subject 1a
is provided with an axially displaceable control piston 3, which is constituted by a piston rod-like central part 3a and two piston-like ends 3b and 3c, which end are inserted into cylindrical piston chambers 4 and 5. It is movable in the axial direction. Subject 1
a has a main inlet P, two outlets A and B, and 2
Two exhaust flow paths R and S are provided. These outlets are connected to each other in a known manner by the position of the corresponding control piston 3.

A first branch channel 7 and a second branch are provided with a nozzle 7a which guides the main channel 6 from the chamber accommodating the central part 3a of the control piston 3 to the housing cover 1c, where it opens into the piston chamber 5. The piston end 3c can be actuated by a pressure fluid for the movement of the control piston 3, as will be described later. Furthermore, cover 1
c is provided with a third branch passage 9, which communicates not only with the second branch passage 8 but also with the piston chamber 5, as shown in FIG. Furthermore, these two branch channels 8 and 9 communicate with an exhaust nozzle 10 in the housing cover 1c, which in the illustrated embodiment opens into the secondary housing 2,
This sub-housing here communicates with the atmosphere via an opening 11. Throttles 12 and 13 are provided in the branch channels 8 and 9 so that the fluid flowing out through the exhaust nozzle 10 can flow out in a restricted manner. The first branch flow path 7 does not have a cross-sectional constriction section other than the nozzle 7a, and allows the fluid to flow into the piston chamber 5 through this flow path with almost no restriction. The flow path cross section of the other throttle 13 is smaller than the flow path cross section of the inflow nozzle 7a of the first branch flow path 7,
When a, 10 is opened and a fluid pressure is generated, an overpressure higher than atmospheric pressure always occurs in the piston chamber 5.

The main flow channel 6 communicates with the main inlet P at each position of the control piston 3 and further extends into the piston chamber 5 which is directed to the back side of the piston end 3c via the through hole 14.
It is also connected to the area of

Sub-housing 2 provided at the end of housing 1
is the exhaust nozzle 1 in the housing cover 1c
A closure device 15 for 0 is provided. The closing device comprises a ring-shaped or rectangular iron core 16 and an electric coil 17 attached to the iron core, which is supplied with electricity via a conductor 18. The iron core 16 is provided with a diametrically magnetized permanent ring magnet 19 which is held in substantially semicircular and slightly offset recesses 16a and 16b of the iron core. The purpose of locating the notches 16a, 16b slightly off-centered will be explained as follows. That is, the magnet 19 is inserted into the notches 16a, 16b.
When it is swingably attached to the arm 20 inside the notch, two gaps S ₀ and S ₁ are created in the notch. Of course, the magnet 19 has a north pole and a south pole. Therefore, if the current to coil 17 is cut off, arm 20
is the S pole and N pole of the iron core 16 and the N pole and S pole of the magnet 19.
The poles attract each other and occupy the position where the air gap S ₀ is minimum. Next, when power is supplied to the coil 17, the magnetic poles of the iron core switch and repel the magnet 19,
As a result, the arm 20 swings and closes the exhaust nozzle 10. In this state, when the current to the coil 17 is cut off and the magnetic engagement between the magnet 23 and the magnetic iron body 22 is released, the ring magnet 19 along with the arm 20
Since the magnetic pole No. 6 returns to its initial state, it returns to its initial position.

The ring magnet 19 further comprises a rocking arm 20, which in the illustrated embodiment is formed as an angle, one leg of which is connected to the exhaust nozzle 1.
The other leg, which comprises a zero closing body 21 and a magnetic iron body 22 and is connected to the ring magnet 19, is provided with a weight 40 at its free end. This weight is the oscillating arm 20
The swing axis of the ring magnet 19 substantially coincides with the midpoint of the ring magnet 19, so that the ring magnet 19 and the swing arm 20 can have the smallest rotational inertia. The illustrated position of the ring magnet simultaneously indicates the initial position of the swinging arm 20, in which the swinging arm is placed in the electric coil 1.
7 and return according to other conditions.

When current is supplied to the coil 17, the iron core 16 is magnetized and causes the ring magnet 19 to swing together with the swing arm 20, so that the closure body 21 blocks the exhaust nozzle 10. In the illustrated case, the swing angle of the swing arm 20 is approximately 30-45 degrees. Although such a swing angle is preferred, ranges of up to 90° can be used. Swing angles exceeding 90° should be avoided as much as possible.

When the swinging arm 20 pivots, the iron or ferrite object 22 also comes into contact with the housing cover 1c, and the permanent magnet 23 fixed to the piston end 3c
Fixed by In the illustrated embodiment, the permanent magnet consists of a plate-like object and the control piston 3
It extends axially parallel to the longitudinal axis 24 of. This permanent magnet 23 also fits into a hole 25 in the housing cover 1c, inside which the outside is sealed so that the piston chamber 5 cannot allow fluid to escape outward.

When modifying, the swinging arm 20 has a ferrite body 2.
Rather than supporting 2 as a specific part, it is also possible to form this end region of the swinging arm 20 itself as a magnetic iron body. Furthermore, the swing arm 20
can also be made of non-magnetic material. moreover,
A permanent magnet can be arranged in place of the ferrite body 22 on the swing arm 20, and a ferrite body or the like can also be attached to the piston end 3c. In other modifications, a conventional hinge anchor system can be used instead of the above system of iron core 16 and electric coil 17, but in this case the hinge anchors are balanced. In this case, this kind of balance hinge anchor has two permanent magnets.
It has a magnetic iron body that cooperates with 3.

An electric or electronic switching circuit 26 is provided to interrupt the current to the electric coil 17 when the swing arm is in the closed position and the exhaust nozzle 10 is interrupted by the closure 21. This switching circuit can also be configured in such a way that the current supply to the electric coil 17 is already interrupted when the swing arm 20 is not yet completely in its closed position. This is because at the end position where the nozzle 7a of the first branch flow path 7 is blocked by the end 3c, the attraction force of the permanent magnet 23 at the piston end 3c is extremely large, and the ferrite fixed to the swing arm is This is because the suction of the body 22 can cause the swinging arm 20 to swing. Therefore, the energization time of the coil 17 is kept extremely short. The configuration of this switching circuit 26 can be realized, for example, using C-MOS technology, so that the power consumption of the switching circuit can be reduced to the self-charging limit of the conventional alkaline or lithium battery that supplies power to the coil 17. can. In the above embodiment, the sub-housing 2 and the control system therein are provided only at the right end of the valve. Only an inlet X is provided at the left end of the valve, through which fluid for returning the control piston 3 is introduced. In this embodiment, the control piston 3 is in the initial position secured by the return spring 27. This spring rests on the one hand against the housing cover 1b and on the other hand against the other end of the piston 3b.

The valve described above operates as follows. As shown in FIG. 1, when the control piston 3 is in its initial position, the piston end 3c keeps the inflow nozzle 7a of the first branch channel 7 isolated from the piston chamber 5. As shown in FIG.

A fluid signal is fed into the main body 1a via the inlet P, with a corresponding actuating signal first being fed via the outlet B. At the same time, a control signal is branched from this inflow signal, and this control signal reaches the first branch channel 7 and the second branch channel 8 via the main channel 6. However, the control signal also reaches the rear region of the piston chamber 5 via the through hole 14 . Piston end 3
Since the force acting on the back side of piston c is greater than the force acting on the piston end 3c via the first branch channel 7, the piston end 3c remains in the initial position shown. The auxiliary fluid present in the main channel 6 is thus discharged from the second branch channel 8 via the open exhaust nozzle 10 and the further opening 11 into the atmosphere in the case of a pneumatic fluid.

When switching the control piston 3, the electric coil 1
7 is energized so that the magnetic flux in the iron core 16 causes the ring magnet 19 to pivot and the swing arm 20 to pivot, thus moving the swing arm away from its initial position. Thereafter, when the arm 20 is in its closed position and blocks the exhaust nozzle 10, the coil 1
7 is again interrupted by the switching circuit 26. The swinging arm 20 tries to return, but the swinging arm 20
Piston end 3c to which the ferrite body 22 of
The swinging arm is kept in its closed position by the permanent magnet 23 of. Thus, fluid can no longer exit via the exhaust nozzle 10, and this fluid completely presses the right side of the piston in the drawing through the entire branch channel. Since a smaller force is exerted on the left side of the piston end 3c by the central part 3a of the control piston 3, the control piston 3 is displaced completely to the left, thus breaking the connection P-B and creating a new connection P-A. is formed. The working fluid thus exits the valve via outlet A.

In this switching, the permanent magnet 23 of the piston end 3c is also displaced to the left and is sufficiently separated from the ferrite body 22 of the swinging arm 20, so that the magnetic force compared to the return force of the closing device 15 moves the swinging arm to its position. It is no longer sufficient to keep it in the closed position.

Furthermore, the main channel 6 communicates with the inlet P, so that a pressure fluid is introduced, so that this fluid reaches the branch channels 7 and 8. Since the branch channels 8 and 9 each have one throttle 12 or 13, the right side of the piston end 3c is further pressed through the large cross-section nozzle 7a in the first branch channel without restriction. The exhaust nozzle 10 is open. The control piston 3 therefore assumes its new position.

In order to return the control piston 3 again after the desired time, a fluid signal is supplied via the inlet The magnet 23 is also forcibly displaced again. In this state of the control piston, outlet A is again blocked, while outlet B provides a fluid pressure signal when signal P occurs.

The embodiment shown in FIG. 2 differs from the first embodiment in that, for returning the control piston 3, a pre-adjusted closing device 28 is also provided at the other end of the illustrated valve. This closure device is housed in the other sub-housing 29 and is otherwise constructed similarly to the corresponding closure device 15 in the sub-housing 2;
The same reference numerals are therefore used for both closure devices and the above reference numerals are used for the same parts. Another difference is that two main channels 6a and 6b are provided, which alternately introduce auxiliary fluid or make it unpressurized. In the illustrated case, the flow path 6b on the right side is connected to the inlet P, whereas the main flow path 6a on the left side is pressureless. Furthermore, the cover 1b has also changed. That is, it is the same as the cover 1a, but both covers do not include a throttle in the third branch flow path 9.
In this case, the main channels 6a, 6b are pressureless after the switching of the control piston 3, so that no throttle is necessary. Central part 3 of the control piston 3 in the drawings
As can be seen from the configuration in section a, when the control piston 3 is switched, the main flow path 6b on the right side becomes pressureless, whereas the main flow path 6a on the left side is pressed by the pressure fluid from the inlet P. Furthermore, this valve 41 functions in exactly the same way as the valve described above, i.e. to return the control piston 3, the left-hand closing device 28 is actuated to close the corresponding exhaust nozzle 10, thereby displacing the piston 3. The piston chamber 4 is pressurized accordingly.

FIGS. 3 to 8 show still other embodiments. All these embodiments have the following points in common. That is, the end 3c of the control piston 3 is provided with a central projection 31 which passes through the axial bore 30 of the housing cover 1b in the initial position of the control piston, the end of which pointing towards the closing device 15 is equipped with a permanent magnet. An insert 32 is provided. This insert 32, which is provided at the other end of the projection and faces the body 22 of the arm 20, can also be provided as a central compact insert according to FIGS. 3, 4 and 7; It can also be formed as a ring as shown in FIGS. 5, 6 and 8. Alternatively, the insert 32 or the projection 31 can also be designed as a magnetic iron body in the end region and a permanent magnet can be provided on the arm 20.

Branch channels 7, 8 and 9 can also be formed in connection with the protrusion 31, respectively. For this purpose, FIG. 3 shows an alternative cross-section of the branch channel 7 opening into the piston chamber 5. Furthermore, the axial hole 32 of the housing cover 1c is provided with an enlarged part 33 pointing towards the end 3c of the control piston 3.
This enlargement, together with the corresponding section of the projection 31, forms a ring chamber 34, which is the third ring chamber.
As shown, it opens into a first branch channel 7, where the ring chamber is sealed by the base of the piston end 3c in a cover 1c, also shown in FIG.

In this embodiment, an external auxiliary signal X1 is fed into the device according to the invention via a connection 6c. Branch channels 7 and 8 are led out from this connection as shown, and branch channels 8 and 9 are preferably formed via a common hole, which for example connects to hole 30 of cover 1c. Nozzles 10 and 13 are provided at both ends thereof.
will be established.

In this embodiment, as in the other embodiments, the closure device 15 is shown only partially in order to show more detail and comprises an arm 20 carrying objects 21 and 22. This closure device corresponds to the figures shown and described in FIGS. 1 and 2.

Furthermore, although the housing 1 is modified as shown, the main part 1a is surrounded by peripherally mounted cover plates 1d and 1e, although this is not necessary.

The embodiment according to FIG. 4 differs from the embodiment according to FIG. 3 in that the above-mentioned ring chamber is formed in the protrusion 31. For this purpose, the projection 31 is formed with a smaller diameter along its central section 35 so that the hole 30 in the cover 1c forms a ring chamber 36, which is located at the illustrated position on the piston end 3c. It is made to communicate with the first branch flow path 7 at. Furthermore, the ring chamber 36 is sealed off by a section 37 of the projection 31 which has a larger diameter than the piston chamber 5 in this position of the piston. Furthermore, the section 37 is provided with a conventional O-ring 37a for sealing in its groove. Furthermore, the bore 30 preferably points towards the piston chamber 5.
A small bevel 30a is provided at the end of the O-ring 37a to facilitate introduction of the O-ring 37a into the hole. When the piston 3 c is displaced to the left from the initial position shown, the flow channel 7 communicates with the front region of the piston chamber 5 via the ring chamber 36 .

The embodiment according to FIGS. 5, 6, 7 and 8 differs from the embodiment according to FIGS. 3 and 4 in the following respects. That is, another method is selected for the configuration of the branch channels 7 and 9. Fifth
According to the figure, the third branch channel 9 is formed as a central hole passing axially through the projection 31 and is connected to the exhaust hole 10 at the end pointing toward the closure device 15.
and move the other end to another throttle 1.
Connect to 3. According to FIG. 5, said central bore extends as far as the piston end 3c and opens the throttle in the front region of the piston chamber 5. Between both ends of the center hole, the protrusion 31 has a horizontal hole 31a and a peripheral groove 31b, and the center hole or the third branch channel 9 communicates with the second branch channel 8 via these regions.

The embodiment according to FIG. 6 differs from the embodiment according to FIG. 5 in the following points. That is, the protruding portion 31, the piston end portion 3c, and the central portion 3a of the control piston 3 are integral, and the central hole portion including the third branch flow path 9 extends to the central portion 3a. The wide additional peripheral groove part 8a provided in the central part 3a is substantially the second
A part of the branch flow path 8 is formed, and a centrally running hole is communicated with this section via a throttle 12. A further throttle 13 is arranged on the projection 31 and connected between the third branch channel 9 and the front region of the piston chamber 5 .

Other features of the embodiment according to FIGS. 5, 6 and 7 are as follows. That is, the first branch channel 7 opens into the front region of the piston chamber 5 in another position, i.e. into a circumferential position of the piston chamber 5 as shown.

FIG. 8 shows yet another embodiment, which is simpler in construction and can be manufactured at extremely low cost. Its essential feature is that the piston end 3c and the associated piston chamber 5 can be formed extremely compact. Therefore, according to FIG. 8, the diameter of the end portion 3c substantially corresponds to the piston center portion 3a. Furthermore, the end portion 3c forms an integral body with the protruding portion 31 and the central portion 3a. The other piston end 3b is connected to said integral member by a screw 42.

Said integral member is further provided with a central hole 38 extending axially therethrough, thereby forming second and third branch channels 8 and 9 and a fourth channel 39 . The flow passages 9 and 39 communicate with the back side of the piston chamber 5 or the other piston end 3b through side holes 9a and 39a, as shown in FIG. Furthermore, the central hole 3 pointing toward the closure device 15
The end of 8 is provided with an exhaust opening 10. For the purpose of forming the first branch flow path 7, an enlarged part 33 is provided in the axis hole 30 of the protrusion 31, and a ring chamber is formed by the cooperation of this enlarged part and the protrusion 31. It is sealed by the piston end 3c.

The embodiment according to FIGS. 3 to 8 has the technical advantage that it can be manufactured more cheaply and can function similarly to the embodiment according to FIGS. 1 and 2.

In addition to the above advantages, the embodiments described above also have the advantage of being able to use a microprocessor. This is because this field relies on the availability of complex control devices and is operated automatically. Another advantage is that it has a simple geometry for the fluidic components. This is because extremely tight manufacturing tolerances are not required.

These features can be used to great advantage with valves of the above technology. However, it is also possible to provide other fluid-operated devices, for example processing cylinders, with corresponding features.

[Brief explanation of the drawing]

1 and 2 show a first diagram of the device according to the invention.
FIGS. 3 to 8 are partial axial sectional views of still other embodiments. FIG. 1, 2... Housing, 3... Piston, 4, 5...
Piston chamber, 6, 7, 8, 9... Channel, 10... Nozzle, 11... Opening, 12, 13... Throttle, 1
4... Hole, 15... Closing device, 16... Iron core, 17... Electric coil, 18... Conductive wire, 19... Ring magnet, 20
...Arm, 21...Closing body, 22...Magnetic iron body, 23...
Permanent magnet, 24... Axis, 25... Hole, 26... Circuit, 27... Spring, 28... Closing device, 29... Housing, 30... Hole, 31... Projection, 32... Insert, 33... Enlarged part, 34...Ring room, 35...Section, 36...Ring room, 37...Section, 3
8... Hole, 39... Channel, 40... Weight, 41... Valve,
42...screw.

Claims (1)

Claims: 1. At least one fluid control piston displaceable and provided with return means is disposed in a housing, the housing having at least one fluid control piston for driving said control piston in one direction to a first operating position.
an exhaust nozzle and a closing device for closing the exhaust nozzle before the control piston is moved away from the first operating position, the closing device being at least partially displaced by an electromagnet to the closed position and means for retaining the control piston in its closed position by a permanent magnet magnetically engaged thereto and for deenergizing the electromagnet when said closure device is closed; and said closure when said control piston is displaced to open the exhaust nozzle. A device that automatically switches the device is installed,
Electro-hydraulic actuated device, characterized in that the control piston switches the magnetic engagement between the closure device and the permanent magnet. 2. The permanent magnet 23 is formed as a plate-shaped object fixed to the control piston 3 axially parallel to the axial movement of the control piston 3, and a corresponding axially parallel object is formed for accommodating the permanent magnet 23 in the non-magnetic housing cover 1c. 2. Device according to claim 1, characterized in that it is provided with a hole (25) and that the closure device (15) comprises an iron or ferrite body (22) responsive to a permanent magnet. 3. The closing device 15 has a swinging arm 20, which is provided with a closure body 21 for the exhaust nozzle 10, and an iron or ferrite body 22 is provided as a special part on the swinging arm, or as a special part of the swinging arm. 3. The device according to claim 1, wherein a part of the device is formed as a magnetically permeable portion. 4. Device according to claim 3, characterized in that the swing arm 20 of the closure device 15 is balanced. 5. The device according to claim 3 or 4, wherein the swing angle of the swing arm 20 is less than 90 degrees. 6. The swinging arm 20 is fixed to a diametrically permanently magnetized ring magnet 19, and the ring magnet 1
9 is a ring-shaped or rectangular iron core 16 with substantially flat circular notches 16a, 16 slightly displaced relative to each other.
5. The device according to claim 3, 4 or 5, wherein the device is swingably supported by an electric coil 17 on the electric coil 17. 7. Device according to claim 2, characterized in that the iron or ferrite body 22 is a member of a balanced hinge anchor system. 8. Claim 6 or 7, characterized in that the electric coil 17 of the swing arm system 15, 20 or the hinge anchor system is provided with an electronic switching circuit 26 for adjusting the opening/closing time thereof. equipment. 9 a main channel for guiding the auxiliary fluid to at least one control piston end region, which main channel 6 is connected to a first branch channel 7 without restriction and a second branch channel 8 provided with a throttle 12; The end 3c of the control piston 3 is opened into the front region of the built-in piston chamber 5 through an inlet nozzle 7a that can be blocked by the control piston 3, and the first branch flow path 7 is opened into the front region of the built-in piston chamber 5. The two-branch channel 8 has a third branch channel 9
The third branch passage is connected to the front region of the piston chamber 5 on the one hand, and communicates with the exhaust nozzle 10 downstream of the throttle 12 together with the second branch passage 8 on the other hand. An apparatus according to claim 1. 10 the third branch channel 9 further comprises a throttle 13 pointing towards the front region of the piston chamber 5;
10. The device according to claim 9, wherein the cross section of the flow path is smaller than the cross section of the inflow nozzle 7a opening into the piston chamber 5 of the first branch flow path 7. 11 The end 3c of the control piston 3 is located in the axis hole 30 of the housing cover 1c in its initial position.
10. Device according to claim 1 or 9, characterized in that it comprises a central projection 31 passing through the closure device 15, preferably with a permanent magnet 32 at the end of said projection pointing towards the closure device 15. . 12 The axis hole 30 is the end 3c of the control piston 3
It comprises an enlargement 33 which, together with the cross-section of the corresponding projection 31, forms an annular space 34 which communicates with the first branch channel 7 and which is connected by the piston end. 12. The device according to claim 11, characterized in that it is sealed. 13 Section 35 in which the protrusion 31 has a small diameter
This section forms a ring space 36 together with the axis hole 30, communicates this ring space with the first branch flow path 7, and connects the piston end 3c.
Claim 11 characterized in that the section 37 of the protrusion 31 is oriented toward the
Apparatus described in section. 14 A part of the second branch channel 8 and a third branch channel 9 are formed as a central hole extending axially through the projection 31, which hole is formed at its end facing the closure device 15. into the exhaust nozzle 10,
The other end communicates with the piston chamber 5 via another throttle 13, and the horizontal hole 31a of the protrusion 31 and the peripheral groove 31b at both ends.
12. The device according to claim 11, wherein the device communicates with the second branch flow path 8 via. 15 The end portion 3c provided with the protrusion 31 and the central portion 3a of the control piston 3 are integrally configured, and a portion of the second branch flow path 8 and the third branch flow path 9 are formed by the protrusion and the end portion. and a part of said central part are formed as a central hole extending axially through said central hole, which at its end pointing toward the closure device 15 is connected to the exhaust nozzle 1 .
0, and the other end is connected to the throttle 12 of the second branch passage 8, and this throttle is connected to the peripheral groove 8a of the central part behind the piston chamber 5. 12. A device according to claim 11, characterized in that the two parts communicate with each other. 16. Device according to claim 11, 14 or 15, characterized in that the second branch channel 8 opens into the piston chamber 5 in the frontmost peripheral area of the piston chamber. 17 A central hole 38 which integrally constitutes the central part 3a of the control piston 3 and the piston end 3c which is provided with the protrusion 31 and whose diameter corresponds to the piston central part 3a, and which penetrates this integral part in the axial direction. is provided, and this is connected to the second and third branch flow paths 8; 9, 9a.
and into the fourth flow path 39, 39a and at its end pointing towards the closing device 15 the exhaust nozzle 10
the fourth flow path to the other piston end 3b.
The axial hole 30 in the protrusion 31 has an enlarged part 33 which communicates with the back side of the control piston 3 and which points towards the end 3c of the control piston 3, and this enlarged part forms a ring-shaped first flow passage 7, which Claim 11 characterized in that the piston end portion 3c seals the piston end portion 3c.
Apparatus described in section.